20984928340 has 12 divisors (see below), whose sum is σ = 44068349556. Its totient is φ = 8393971328.

The previous prime is 20984928323. The next prime is 20984928343. The reversal of 20984928340 is 4382948902.

It can be written as a sum of positive squares in 2 ways, for example, as 5052935056 + 15931993284 = 71084^2 + 126222^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20984928343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524623189 + ... + 524623228.

It is an arithmetic number, because the mean of its divisors is an integer number (3672362463).

Almost surely, 2^20984928340 is an apocalyptic number.

20984928340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20984928340 is an abundant number, since it is smaller than the sum of its proper divisors (23083421216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20984928340 is a wasteful number, since it uses less digits than its factorization.

20984928340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049246426 (or 1049246424 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 20984928340 in words is "twenty billion, nine hundred eighty-four million, nine hundred twenty-eight thousand, three hundred forty".